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Input: add tsc2007 based touchscreen driver
This drive has been tested on ARM9 based SoC - MV86XX. Signed-off-by: Kwangwoo Lee <kwangwoo.lee@gmail.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
parent
8bbf2703c4
commit
50b6f1f4a4
@ -389,4 +389,15 @@ config TOUCHSCREEN_TOUCHIT213
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To compile this driver as a module, choose M here: the
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module will be called touchit213.
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config TOUCHSCREEN_TSC2007
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tristate "TSC2007 based touchscreens"
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depends on I2C
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help
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Say Y here if you have a TSC2007 based touchscreen.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called tsc2007.
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endif
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@ -25,6 +25,7 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
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obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
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obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
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obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
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381
drivers/input/touchscreen/tsc2007.c
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381
drivers/input/touchscreen/tsc2007.c
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@ -0,0 +1,381 @@
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/*
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* drivers/input/touchscreen/tsc2007.c
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*
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* Copyright (c) 2008 MtekVision Co., Ltd.
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* Kwangwoo Lee <kwlee@mtekvision.com>
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*
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* Using code from:
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* - ads7846.c
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* Copyright (c) 2005 David Brownell
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* Copyright (c) 2006 Nokia Corporation
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* - corgi_ts.c
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* Copyright (C) 2004-2005 Richard Purdie
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* - omap_ts.[hc], ads7846.h, ts_osk.c
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* Copyright (C) 2002 MontaVista Software
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2005 Dirk Behme
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/hrtimer.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/i2c/tsc2007.h>
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#define TS_POLL_DELAY (10 * 1000) /* ns delay before the first sample */
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#define TS_POLL_PERIOD (5 * 1000) /* ns delay between samples */
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#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
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#define TSC2007_MEASURE_AUX (0x2 << 4)
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#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
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#define TSC2007_ACTIVATE_XN (0x8 << 4)
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#define TSC2007_ACTIVATE_YN (0x9 << 4)
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#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
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#define TSC2007_SETUP (0xb << 4)
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#define TSC2007_MEASURE_X (0xc << 4)
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#define TSC2007_MEASURE_Y (0xd << 4)
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#define TSC2007_MEASURE_Z1 (0xe << 4)
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#define TSC2007_MEASURE_Z2 (0xf << 4)
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#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
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#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
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#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
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#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
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#define TSC2007_12BIT (0x0 << 1)
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#define TSC2007_8BIT (0x1 << 1)
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#define MAX_12BIT ((1 << 12) - 1)
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#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)
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#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
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#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
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#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
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#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
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#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)
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struct ts_event {
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u16 x;
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u16 y;
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u16 z1, z2;
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};
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struct tsc2007 {
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struct input_dev *input;
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char phys[32];
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struct hrtimer timer;
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struct ts_event tc;
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struct i2c_client *client;
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spinlock_t lock;
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u16 model;
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u16 x_plate_ohms;
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unsigned pendown;
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int irq;
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int (*get_pendown_state)(void);
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void (*clear_penirq)(void);
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};
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static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
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{
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s32 data;
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u16 val;
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data = i2c_smbus_read_word_data(tsc->client, cmd);
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if (data < 0) {
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dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
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return data;
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}
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/* The protocol and raw data format from i2c interface:
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* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
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* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
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*/
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val = swab16(data) >> 4;
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dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
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return val;
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}
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static void tsc2007_send_event(void *tsc)
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{
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struct tsc2007 *ts = tsc;
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u32 rt;
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u16 x, y, z1, z2;
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x = ts->tc.x;
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y = ts->tc.y;
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z1 = ts->tc.z1;
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z2 = ts->tc.z2;
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/* range filtering */
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if (x == MAX_12BIT)
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x = 0;
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if (likely(x && z1)) {
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/* compute touch pressure resistance using equation #1 */
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rt = z2;
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rt -= z1;
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rt *= x;
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rt *= ts->x_plate_ohms;
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rt /= z1;
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rt = (rt + 2047) >> 12;
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} else
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rt = 0;
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/* Sample found inconsistent by debouncing or pressure is beyond
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* the maximum. Don't report it to user space, repeat at least
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* once more the measurement
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*/
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if (rt > MAX_12BIT) {
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dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
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hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
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HRTIMER_MODE_REL);
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return;
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}
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/* NOTE: We can't rely on the pressure to determine the pen down
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* state, even this controller has a pressure sensor. The pressure
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* value can fluctuate for quite a while after lifting the pen and
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* in some cases may not even settle at the expected value.
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*
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* The only safe way to check for the pen up condition is in the
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* timer by reading the pen signal state (it's a GPIO _and_ IRQ).
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*/
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if (rt) {
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struct input_dev *input = ts->input;
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if (!ts->pendown) {
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dev_dbg(&ts->client->dev, "DOWN\n");
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input_report_key(input, BTN_TOUCH, 1);
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ts->pendown = 1;
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}
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input_report_abs(input, ABS_X, x);
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input_report_abs(input, ABS_Y, y);
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input_report_abs(input, ABS_PRESSURE, rt);
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input_sync(input);
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dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
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x, y, rt);
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}
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hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
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HRTIMER_MODE_REL);
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}
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static int tsc2007_read_values(struct tsc2007 *tsc)
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{
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/* y- still on; turn on only y+ (and ADC) */
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tsc->tc.y = tsc2007_xfer(tsc, READ_Y);
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/* turn y- off, x+ on, then leave in lowpower */
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tsc->tc.x = tsc2007_xfer(tsc, READ_X);
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/* turn y+ off, x- on; we'll use formula #1 */
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tsc->tc.z1 = tsc2007_xfer(tsc, READ_Z1);
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tsc->tc.z2 = tsc2007_xfer(tsc, READ_Z2);
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/* power down */
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tsc2007_xfer(tsc, PWRDOWN);
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return 0;
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}
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static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
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{
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struct tsc2007 *ts = container_of(handle, struct tsc2007, timer);
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spin_lock_irq(&ts->lock);
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if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
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struct input_dev *input = ts->input;
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dev_dbg(&ts->client->dev, "UP\n");
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input_report_key(input, BTN_TOUCH, 0);
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input_report_abs(input, ABS_PRESSURE, 0);
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input_sync(input);
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ts->pendown = 0;
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enable_irq(ts->irq);
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} else {
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/* pen is still down, continue with the measurement */
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dev_dbg(&ts->client->dev, "pen is still down\n");
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tsc2007_read_values(ts);
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tsc2007_send_event(ts);
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}
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spin_unlock_irq(&ts->lock);
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return HRTIMER_NORESTART;
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}
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static irqreturn_t tsc2007_irq(int irq, void *handle)
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{
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struct tsc2007 *ts = handle;
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unsigned long flags;
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spin_lock_irqsave(&ts->lock, flags);
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if (likely(ts->get_pendown_state())) {
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disable_irq(ts->irq);
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hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
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HRTIMER_MODE_REL);
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}
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if (ts->clear_penirq)
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ts->clear_penirq();
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spin_unlock_irqrestore(&ts->lock, flags);
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return IRQ_HANDLED;
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}
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static int tsc2007_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tsc2007 *ts;
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struct tsc2007_platform_data *pdata = pdata = client->dev.platform_data;
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struct input_dev *input_dev;
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int err;
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if (!pdata) {
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dev_err(&client->dev, "platform data is required!\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -EIO;
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ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ts || !input_dev) {
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err = -ENOMEM;
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goto err_free_mem;
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}
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ts->client = client;
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i2c_set_clientdata(client, ts);
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ts->input = input_dev;
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hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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ts->timer.function = tsc2007_timer;
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spin_lock_init(&ts->lock);
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ts->model = pdata->model;
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ts->x_plate_ohms = pdata->x_plate_ohms;
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ts->get_pendown_state = pdata->get_pendown_state;
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ts->clear_penirq = pdata->clear_penirq;
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pdata->init_platform_hw();
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snprintf(ts->phys, sizeof(ts->phys), "%s/input0", client->dev.bus_id);
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input_dev->name = "TSC2007 Touchscreen";
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input_dev->phys = ts->phys;
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input_dev->id.bustype = BUS_I2C;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);
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tsc2007_read_values(ts);
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ts->irq = client->irq;
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err = request_irq(ts->irq, tsc2007_irq, 0,
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client->dev.driver->name, ts);
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if (err < 0) {
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dev_err(&client->dev, "irq %d busy?\n", ts->irq);
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goto err_free_mem;
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}
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err = input_register_device(input_dev);
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if (err)
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goto err_free_irq;
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dev_info(&client->dev, "registered with irq (%d)\n", ts->irq);
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return 0;
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err_free_irq:
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free_irq(ts->irq, ts);
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hrtimer_cancel(&ts->timer);
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err_free_mem:
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input_free_device(input_dev);
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kfree(ts);
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return err;
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}
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static int tsc2007_remove(struct i2c_client *client)
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{
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struct tsc2007 *ts = i2c_get_clientdata(client);
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struct tsc2007_platform_data *pdata;
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pdata = client->dev.platform_data;
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pdata->exit_platform_hw();
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free_irq(ts->irq, ts);
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hrtimer_cancel(&ts->timer);
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input_unregister_device(ts->input);
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kfree(ts);
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return 0;
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}
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static struct i2c_device_id tsc2007_idtable[] = {
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{ "tsc2007", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
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static struct i2c_driver tsc2007_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "tsc2007"
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},
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.id_table = tsc2007_idtable,
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.probe = tsc2007_probe,
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.remove = tsc2007_remove,
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};
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static int __init tsc2007_init(void)
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{
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return i2c_add_driver(&tsc2007_driver);
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}
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static void __exit tsc2007_exit(void)
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{
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i2c_del_driver(&tsc2007_driver);
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}
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module_init(tsc2007_init);
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module_exit(tsc2007_exit);
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MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
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MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
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MODULE_LICENSE("GPL");
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17
include/linux/i2c/tsc2007.h
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17
include/linux/i2c/tsc2007.h
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@ -0,0 +1,17 @@
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#ifndef __LINUX_I2C_TSC2007_H
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#define __LINUX_I2C_TSC2007_H
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/* linux/i2c/tsc2007.h */
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struct tsc2007_platform_data {
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u16 model; /* 2007. */
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u16 x_plate_ohms;
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int (*get_pendown_state)(void);
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void (*clear_penirq)(void); /* If needed, clear 2nd level
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interrupt source */
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int (*init_platform_hw)(void);
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void (*exit_platform_hw)(void);
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};
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#endif
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